This document describes different types of valves including a manually actuated three-position valve, a four-way two-position valve, and a spring-centered three-position valve. It also discusses a typical solenoid controlled, pilot operated or two-stage valve where the pilot choke is mounted on the valve.

4. Manually (lever) actuated, three-
position

6. Four-way, two position valve

7. Spring-centered valve is a three-
position valve

8. Typical solenoid controlled, pilot
operated valve (two-stage valve)

9. Pilot choke mounted on valve

10. Pilot choke mounted on valve